Tests for Anions

Cards (17)

  • What are anions?
    Negatively charged ions
  • What tests are covered for anions in the video?
    • Test for carbonate ions
    • Test for sulfate ions
    • Test for halide ions
  • What happens when a carbonate reacts with an acid?
    It forms a salt, carbon dioxide, and water
  • How can you test for carbonates in a solution?
    Add dilute hydrochloric acid and lime water
  • What indicates a positive test for carbonates?
    Lime water turns cloudy
  • What is the first step in the sulfate test?
    Add dilute hydrochloric acid
  • Why do we add dilute hydrochloric acid in the sulfate test?
    To remove carbonate or sulfite impurities
  • What forms when barium ions react with sulfate ions?
    Barium sulfate, a white precipitate
  • What is the key result of the sulfate test?
    Formation of a white precipitate
  • What is the first step in the halide test?
    Add dilute nitric acid
  • What is added in the second step of the halide test?
    Add silver nitrate solution
  • What do silver ions react with in the halide test?
    Halide ions to form precipitates
  • What color precipitate forms with chloride ions?
    White precipitate (silver chloride)
  • What color precipitate forms with bromide ions?
    Cream precipitate (silver bromide)
  • What color precipitate forms with iodide ions?
    Yellow precipitate (silver iodide)
  • What is the process for testing halide ions?
    1. Add dilute nitric acid to remove impurities
    2. Add silver nitrate solution
    3. Observe precipitate color:
    • White for chloride
    • Cream for bromide
    • Yellow for iodide
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